Circle Opens Arc Mainnet to Broaden USDC’s Role in Payments and Fees

Circle plans to launch Arc publicly on Sept. 16, creating a network where one USDC balance can support both payments and transaction fees. That simplification could remove a common hurdle for stablecoin users and provide Circle with another route to increased USDC demand as competition with Tether intensifies.

The public mainnet follows Arc’s private network, which Circle said included more than 100 ecosystem and institutional builders in August.

Arc’s public testnet opened Oct. 28, 2025. The Sept. 16 milestone will mark its transition to a live production network, where the design can face a broader commercial test.

One balance for payments and fees

Arc is a layer-1 blockchain that operates its own network. Its documentation describes an Ethereum-compatible environment built around stablecoin transactions, using USDC for network fees while targeting transaction finality in less than a second.

On many Ethereum-compatible chains, a user may hold enough USDC to make a payment but lack a separate token to cover the associated network fee. Obtaining that second asset adds another step before a transaction can proceed.

Arc’s model combines those functions. Users can hold and send USDC while paying fees from the same underlying balance. Developers can use familiar Ethereum tools while designing applications in which spending and transaction costs are denominated in the same asset.

For payment products, that could streamline onboarding and balance management. It also gives USDC an operational role in every fee-paying transaction on the network, beyond serving as an asset that an application merely supports.

Circle’s wallet integration guidance further clarifies that USDC’s native and token interfaces represent the same balance. They provide two software access methods for one holding, so displaying them as separate balances would double-count a user’s funds.

In practice, users can pay the required fee with the same asset they intend to spend.

Arc pairs open developer access with a permissioned validator set. Anyone can build applications on the network, while validation is restricted to selected operators.

Circle’s announced founding validator cohort includes BlackRock, DTCC, Visa, Mastercard, Standard Chartered and other financial firms alongside Circle. That places major institutional participants within the network’s operating structure.

For businesses evaluating blockchain settlement, the involvement of these institutions is a defining feature of Arc. It also means that permissionless access for application developers does not imply permissionless participation in network validation.

The founding validator roster and private-network builder count indicate interest, but they do not demonstrate how much demand the public launch will attract.

Arc also promotes opt-in privacy, although its execution documentation still lists Arc Privacy Sector and Stablecoin Services as planned and unavailable.

Arc’s path to greater USDC demand

Circle reported $73.3 billion in USDC circulation at the end of June, while Tether reported approximately $184.6 billion in USDT issued at the same quarter-end. Those figures highlight the scale difference entering Arc’s scheduled launch.

Arc gives Circle a potential route to increased usage by making USDC the balance customers need for both financial applications and the transactions that power them. Payments and institutional settlement could encourage users to maintain funds in USDC.

However, greater Arc activity and additional USDC demand are not necessarily the same outcome. Moving an existing USDC balance from another chain to Arc changes where it is used, while paying fees in USDC demonstrates utility without proving a gain in market share.

The decisive test is whether simpler transactions prompt customers to inject new money into USDC and sustain their usage. Arc’s public network can provide the infrastructure for that shift, but the launch itself cannot establish it.

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